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Comparison of Multi-Stage Rake Furnaces/Rotary Kilns in Mineral Roasting Applications Project Multi-stage rake furnace Rotary kiln Temperature control Capable of achieving optimal temperature linear regulation. The furnace temperature cannot be precisely controlled and cannot be adjusted. Oxygen content control Precisely control the oxygen content in each furnace bed to meet the oxygen supply requirements for roasting. Unable to precisely control oxygen, resulting in poor product quality stability. Stable operation Can achieve fully automatic control. Experience-driven control Thermal energy utilization It can increase the temperature of the exhaust flue gas and recover waste heat. The flue gas temperature is low, so the low-temperature heat cannot be utilized. Energy loss High thermal efficiency, cascaded utilization of thermal energy, low fuel consumption. Relatively low thermal efficiency, high air leakage, and high fuel consumption. Power consumption Low exhaust volume, low power consumption Large exhaust volume, high power consumption. Product High product uniformity, high oxidation efficiency, and high product yield. Low product uniformity, low oxidation efficiency, and low product yield. Environmental protection Secondary reheating of flue gas, compliant emission of flue gases, environmentally friendly. The exhaust gas volume is large, with virtually no secondary reheating, and the flue gas emissions fail to meet standards. Land area Vertical furnace body, occupies a small footprint. Horizontal furnace body, with a large footprint—approximately three times that of a vertical furnace. Investment The main equipment is expensive, requiring a relatively large one-time investment. Investment is slightly lower, about 0.8 times that of a vertical furnace.
Mineral roasting
Comparison of Multi-Stage Rake Furnaces/Rotary Kilns in Mineral Roasting Applications
Keywords: Mineral roasting
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